Check the device thoroughly before buying used laptop for sale in Bangalore.

1. Physical Inspection: - Check for visible damage, scratches, dents or marks on the laptop's body and screen.
- Check that the hinges are in good condition.
- Check that all ports, connectors and buttons are present and functioning.

2. Hardware Inspection: - Test the keyboard for functionality and responsiveness.
- Check the trackpad or pointing device for proper operation and accuracy.
- Check the display for dead pixels, discoloration, or other abnormalities.
- Check the webcam, speakers and microphone for functionality.
- Test all ports (USB, HDMI, audio, etc.).

3. Battery Health: - Check battery health and remaining capacity with built-in diagnostic tools or third-party software.
- Test the battery life under normal usage conditions.
- Ask about the battery replacement history of the laptop and any warranty on the battery.

4. Software Check: - Check the operating system installed on the laptop and verify its authenticity.
- Install and update all necessary drivers and software.
- Run diagnostic tests or benchmarking tools to check the performance of the laptop.

5. Verification of Specifications: - Check that the specs (processor, graphics card, storage, RAM, etc.) match exactly what the seller describes on the laptop.
- Check hardware configuration and upgrades in BIOS or system information.

6. Histories and Usage: - Ask about the usage history of the laptop, including past repairs, upgrades, or issues.
- Ask the seller whether the laptop has had any accidents, spills or drops.
- Check the warranty and remaining coverage from the manufacturer or seller.

7. Documentation & Accessories: - Get the laptop with all the documentation including manuals, warranty information and proof of purchase.
- Check for included accessories (chargers, adapters or original packaging).

8. Evaluation of price: - Compare asking price of used laptop with market prices for similar models in Bangalore.
- Consider the condition, age, specifications and included accessories of the laptop when determining the price.
- Negotiate with the seller in case you think the asking price is too high or you found problems with the laptop computer.

9. Return Policy & Warranty: - Ask the seller about his return policy and warranty on the used laptop.
- Know the details of any warranty or guarantee from the seller.
- Make sure you can return the laptop or even get your money back in case it's not everything you anticipated.

Following this checklist and inspecting it can help you buy a quality used laptop in Bangalore that fits your needs and budget.